using System;using System.Collections.Generic;using System.Linq;using System.Runtime.InteropServices;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication2{    class Program    {        static void Main(string[] args)        {            PrScrn();        }        [DllImport("PrScrn.dll", EntryPoint = "PrScrn")]        static extern int PrScrn();    }}

　　

 

创建用控制台项目，属性中改成 输出为 windows应用程序